MTM-15 is a medium-range, 4-wire voice band modem,
operating at data rates up to 19.2 kbps. It is optimized for metropolitan
applications, where the distance is too long for short-range modems.

The MTM-15 Sync/Async modem operates over 4-wire
private or leased lines, conditioned or unconditioned. It uses an adaptive
equalizer and 16-state, 8-dimensional Trellis-coded modulation to achieve
error-free communication. Over conditioned lines, the range depends on
line quality and can reach 100 km (62 miles). Over unconditioned (24 AWG)
lines, MTM 15 has a range of 19 km (12 miles) at 19.2 kbps.

The transmit level is selectable in 3 dB
increments, over the range of 0 to -12 dBm. Transmit timing is provided
internally, or derived externally from the data terminal or from receive
signal. Receive timing is regenerated from the data. Line communication is
always synchronous. When set to Async mode, MTM-15 converts DTE Async data
to Sync format in compliance with V.14 (ITU-T V.22 bis) standard.

MTM-15 features V.54 diagnostics capabilities for
performing local analog loopback and local and remote digital loopbacks.
The loopbacks can be controlled by either front panel push buttons or by
toggling DTE interface pins 18 or 21.

In addition, MTM-15 can perform a Bit Error Test on
the link, using an internal pseudo-random test pattern and a front panel
LED (SQ) that flashes when a bit error is detected. Line quality is tested
continuously. When the bit error exceeds 10-3, the Signal Quality (SQ) LED
flashes.

MTM-15 is available as a standalone unit or as a
rack-mount card for the ASM-MN-214 19" modem rack. The rack can hold up to
fourteen MTM-15 cards. Special hardware is available for mounting one or
two standalone units in a 19" rack.

Medium range voice band modem for metropolitan
applications

Operates over conditioned or unconditioned lines

V.24/RS-232, Sync/Async digital interface

Selectable data rates up to 19.2 kbps

Full duplex transmission over 4-wire cables

Range of 19 km (12 miles) at 19.2 kbps

V.54 diagnostic loops

Internal V.52 test pattern generator and error LED

Real-time, line performance monitoring

QAM and Trellis-coded modulation

Card version for the ASM-MN-214 19" modem rack

MTM-15SA/*Standalone unit

MTM-15/RModem card for the ASM-MN-214 modem rack

ASM-MN-214/*/+19" rack for 14 modem cards

*

Specify standalone and card cage power supply:115 for 115 VAC230 for 230 VAC48 for -48 VDC24 for 24 VDC12 for 12 VDC

+

Specify card cage redundant power supply (same as
main power supply option)